Many points can be derived from that statement if you accept it. mynym's point is a good one. What is important to understand is that different peoples evolved to want to live differently, and mixing them up brings no advantages to anyone, but only conflicts on several different levels. I'm yet to have someone rationally explain to me what "racism" means. Are Jews racist? That seems to be what has kept them as a people for over 5000 years, so is racism then synonymous with long-term survival? Clearly, being cross-race altruistic (such as the Germans, the English and some Nordics nowadays, importing millions of muslims so they can pay taxes) seems to be the opposite of long-term survival, so that could be considered a clue into answering this question. Do we all not love our families more than other people's families? Is one's race not their extended family? So why would it be wrong to love one's extended family over others'? As far as I can understand, a "racist" is someone concerned about ensuring a future-legacy to his extended family.